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Cisco CCNP / BCSI Exam Tutorial: Broadcasts And also theCisco CCNP / BCSI Examination Tutorial: Broadcasts As well as the IP Helper-Tackle CommandAlthough routers acknowledge and crank out broadcasts, they don't ahead them. This can be pretty a dilemma every time a broadcast really should get to a device such as a DHCP or TFTP server that’s on a person side of the router with other subnets on the opposite facet. If a Laptop attempts to Track down a DNS server that has a broadcast, the broadcast might be stopped by the router and will never get to your DNS server. By configuring the ip helper-address command on the router, UDP broadcasts like this tends to be translated into a unicast via the router, making the communication possible. The command ought to be configured on the interface which will be getting the broadcasts.R1(config)#int e0R1(config-if)#ip helper-handle ? A.B.C.D IP spot addressR1(config-if)#ip helper-address one hundred.1.one.2Now, you might be wondering if this command covers all UDP providers. Sorry, you’re not acquiring off that simple! The command does forward 8 popular UDP service broadcasts, although. TIME, port 37TACACS, port forty nineDNS, port 53BOOTP/DHCP Server, port sixty sevenBOOTP/DHCP fast Client, port 68TFTP, port 69NetBIOS name company, port 137NetBIOS datagram service, port 138That’s gonna include most scenarios where the ip helper-deal with command is going to be practical, but what about People situations in which the broadcast you need forwarded isn't on this record? You may use the ip ahead-protocol command to add any UDP port range to the checklist.Also, to eliminate protocols from the default record, utilize the no ip ahead-protocol command. In the next instance, we’ll add the Community Time Protocol port to your forwarding record though eliminating the NetBIOS ports. Keep in mind, you can use IOS Aid to receive a summary of commonly filtered ports!R1(config)#ip ahead-protocol udp ? <0-65535> Port amount biff Biff (mail notification, comsat, 512) bootpc Bootstrap Protocol (BOOTP) client (68) bootps Bootstrap Protocol (BOOTP) server (sixty seven) discard Discard (nine) dnsix DNSIX protection protocol auditing (195) area Area Title Company (DNS, 53) echo Echo (7) isakmp World-wide-web Protection Association and Critical Management Protocol (five hundred) cell-ip Mobile IP registration (434) nameserver IEN116 name provider (out of date, forty two) netbios-dgm NetBios datagram provider (138) netbios-ns NetBios name services (137) netbios-ss NetBios session service (139) ntp Community Time Protocol (123) pim-auto-rp PIM Automobile-RP (496) rip Routing Data Protocol (router, in.routed, 520) snmp Straightforward Community Management Protocol (161) snmptrap SNMP Traps (162) sunrpc Solar Remote Process Simply call (111) syslog Method Logger (514) tacacs TAC Obtain Control Method (49) speak Communicate (517) tftp Trivial File Transfer Protocol (69) time Time (37) who Who company (rwho, 513) xdmcp X Display screen Manager Handle Protocol (177